WALL THICKNESS CONFIGURATION MEASURING DEVICE OF PIPE, ITS METHOD, AND METHOD FOR MANUFACTURING PIPE

摘要

PROBLEM TO BE SOLVED: To stably and accurately measure the wall thickness configuration of a pipe having a portion of which wall thickness changes largely at not only a bead cut portion but also a seam-welded pipe welded portion including a thickened wall portion.;SOLUTION: This wall thickness configuration measuring device of a pipe measures the wall thickness configuration of a seam-welded pipe 2 while running the ultrasonic beam generated by each ultrasonic probe 1-1 to 1-N of a linear array type ultrasonic probe 1 arranged outside the seam-welded pipe 2 in a cross section which crosses the seam-welded pipe 2 in the axial direction. In the linear array type ultrasonic probe 1, the plurality of ultrasonic probes 1-1 to 1-N are array-arranged which generate ultrasonic beams, each of which forms a cylindrical wavefront extending in the cross section and is radiated toward the axis of the seam-welded pipe at least, and whose axial component BMC has intensity larger than a predetermined value. The device includes a wall thickness operation part 8 detecting the seam-welded pipe 2 outer surface echo and seam-welded pipe 2 inner surface echo of the axial component BMC of the scanned ultrasonic beam and measuring the wall thickness configuration of the seam-welded pipe 2.;COPYRIGHT: (C)2010,JPO&INPIT